Rollup merge of #100460 - cuviper:drop-llvm-12, r=nagisa

Update the minimum external LLVM to 13

With this change, we'll have stable support for LLVM 13 through 15 (pending release).
For reference, the previous increase to LLVM 12 was #90175.

r? `@nagisa`

1 files changed, 1 insertions, 17 deletions

diff --git a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
index bdf2a852507..b4314223722 100644
--- a/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
+++ b/compiler/rustc_llvm/llvm-wrapper/PassWrapper.cpp
@@ -870,19 +870,11 @@ LLVMRustOptimizeWithNewPassManager(
                         PGOOptions::NoCSAction, DebugInfoForProfiling);
   }
 
-#if LLVM_VERSION_GE(13, 0)
   PassBuilder PB(TM, PTO, PGOOpt, &PIC);
   LoopAnalysisManager LAM;
   FunctionAnalysisManager FAM;
   CGSCCAnalysisManager CGAM;
   ModuleAnalysisManager MAM;
-#else
-  PassBuilder PB(DebugPassManager, TM, PTO, PGOOpt, &PIC);
-  LoopAnalysisManager LAM(DebugPassManager);
-  FunctionAnalysisManager FAM(DebugPassManager);
-  CGSCCAnalysisManager CGAM(DebugPassManager);
-  ModuleAnalysisManager MAM(DebugPassManager);
-#endif
 
   FAM.registerPass([&] { return PB.buildDefaultAAPipeline(); });
 
@@ -1019,11 +1011,7 @@ LLVMRustOptimizeWithNewPassManager(
     }
   }
 
-#if LLVM_VERSION_GE(13, 0)
   ModulePassManager MPM;
-#else
-  ModulePassManager MPM(DebugPassManager);
-#endif
   bool NeedThinLTOBufferPasses = UseThinLTOBuffers;
   if (!NoPrepopulatePasses) {
     // The pre-link pipelines don't support O0 and require using budilO0DefaultPipeline() instead.
@@ -1438,17 +1426,13 @@ LLVMRustCreateThinLTOData(LLVMRustThinLTOModule *modules,
     Ret->ResolvedODR[ModuleIdentifier][GUID] = NewLinkage;
   };
 
-#if LLVM_VERSION_GE(13,0)
   // Uses FromPrevailing visibility scheme which works for many binary
   // formats. We probably could and should use ELF visibility scheme for many of
   // our targets, however.
   lto::Config conf;
   thinLTOResolvePrevailingInIndex(conf, Ret->Index, isPrevailing, recordNewLinkage,
                                   Ret->GUIDPreservedSymbols);
-#else
-  thinLTOResolvePrevailingInIndex(Ret->Index, isPrevailing, recordNewLinkage,
-                                  Ret->GUIDPreservedSymbols);
-#endif
+
   // Here we calculate an `ExportedGUIDs` set for use in the `isExported`
   // callback below. This callback below will dictate the linkage for all
   // summaries in the index, and we basically just only want to ensure that dead